# Stefano Romano

> Staff Machine Learning Engineer | Production ML & Causal Inference

Location: San Francisco, California, United States
Profile: https://flows.cv/stefanoromano

As a Senior AI Engineer at Prósperos, I develop cutting-edge ML solutions, including Profé, a Spanish-language LLM chatbot, and real-time fraud detection systems with sub-1-second response times. I also drive backend development for our banking platform, building from 0-to-1 in just 6 months.

Previously, at BILL, I built NLP and CV models like BillBert, enabling $700M/year in low-risk payments and $15M/year in revenue. My work included a patented 90%-accurate computer vision model for document processing and a personalized due date prediction model with 14% improved accuracy. These and other projects earned multiple internal awards and showcased my expertise in AI, NLP, CV, and cloud infrastructure.

I hold an MS in Analytics from Georgia Tech and a BA in Statistics from Rice University. Beyond work, I’m a USTA/ITA-certified tennis official and enjoy skiing, rock climbing, and travel.

## Work Experience
### Staff Software Engineer, Data Science @ Northbeam
Jan 2025 – Present | San Francisco Bay Area

### Senior AI Engineer @ Prósperos.ai
Jan 2024 – Jan 2025 | San Francisco Bay Area
- Developed and deployed Profé, a Spanish-language LLM chatbot that assists users with tutorials, teaches financial concepts, and promotes good financial habits.

- Led real-time fraud detection implementation for card transactions with sub-1-second response times, enabling point-of-sale declines based on data-driven insights to protect cardholders.

- Built and deployed the backend service for a banking platform from scratch as part of a 4-person team in 6 months, implementing REST APIs, compliance logic, transaction recording, notifications, document uploads, and testing using Java, Spring, and Postgres.

- Contributed to critical infrastructure tasks, including AWS configuration, firewall implementation, CI/CD pipeline development, third-party API integration, and production/hotfix deployments.

- Owned data pipeline maintenance, API integration, dashboard development, and data analytics; served as the data subject matter expert for executives and cross-functional teams.

### Machine Learning Engineer II @ BILL
Jan 2021 – Jan 2023 | San Francisco Bay Area
- Led development of BillBert, a custom deep learning NLP and CV algorithm enabling sub-10ms search across 2M+ documents, driving $700M/year in low-risk payments and $15M/year in revenue.

- Delivered a patented Python computer vision model (US12046063B2) with over 90% accuracy for extracting line items, enabling real-time predictions for 1.2M+ documents monthly and surpassing competitor performance.

- Developed and productionized machine learning models to enhance payment processing and user predictions, including void propensity ranking for $2B/year workflows and personalized due date forecasting with a 14% accuracy improvement.

- Won multiple internal awards, including First Place Overall in Hackathon for creating an LLM-powered financial insights tool and Judge’s Choice Award for an NLP model predicting customer service outcomes.

### Machine Learning Engineer @ BILL
Jan 2020 – Jan 2021 | Houston, Texas Area

### Business Analyst Intern @ CarMax
Jan 2019 – Jan 2019 | Richmond, Virginia Area
- Revamped repeat-customer purchase propensity model using 20M+ data points of user data to enable improved selection of customers to receive direct mail, driving revenue growth and reducing marketing spend

### Investment Management Intern @ Corient
Jan 2018 – Jan 2018 | Houston, Texas Area
- Investigated 50+ fundamental, technical, and proprietary factors for 5,000+ equities over 20 years to discover predictors of above-market returns for the $250M portfolio; presented findings to firm’s Chief Investment Officer and Head of Equity Analytics


## Education
### Bachelor of Arts - BA in Statistics, Mathematical Economic Analysis
Rice University

### Master of Science - MS in Analytics
Georgia Institute of Technology


## Contact & Social
- LinkedIn: https://linkedin.com/in/stefano-a-romano

---
Source: https://flows.cv/stefanoromano
JSON Resume: https://flows.cv/stefanoromano/resume.json
Last updated: 2026-04-01